Collapsible core-bar for pipes.



' 10.780,981. MTENTBDJAN-24,1905.

A. s. GOLDIB.

GOLLAPSIBLE GORE BAR FOR PIPE-S.

APPLIUATION FILED MR. 19. 1904.

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No. r180,881. BATBNTED'JANM, 1905il A. s. GOLDIE. j

GOLLAPSIBLB CORE B881F08 PIPES.

APPLICATION FILED MAR. 19. 1904.

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I UNITED STATES" Patented January 24, 1905.

Al)ATENTv OFFICE.

ALEXANDER S. GOLDIE, OF UDDINGSTON, SCOTLAND.

ooLLAPslBLE CORE-BAR Fon PIPEs.

SPECIFICATION forming part of Letters Patent No. 780,881, dated January 24, 1905.

Application filed March 19, 1904:. Serial No. 199,013.

To all whom, t'mcty concern:

Be it known that I, ALEXANDER SOMMER- vILLE GOLDIE, iron-founder, a subject of the King of Great Britain and Ireland, and a resident of Uddingston, Scotland, have invented new and useful Improvements in Collapsible Gore-Bars for Pipes, Tubes, or other Hollow Articles, (for which I have filed anapplication for a patent in Great Britain numbered 17,933 and dated the 19th of August, 1903,) of which the following is a specification.

This invention has reference to improvements in and relating to collapsible core-bars for pipes, tubes, and other hollow articles or for patterns in casting ingots and such like purposes, andwhich may be formed for treating circular, oval, square, or polygonally shaped sections, and requiring no bolts or rivets, and essentially comprises an improved mode of eX- panding and permitting the core-plates to collapse and contract.

In order that my said invention and the manner of carrying same into practice may be properly understood, I have hereunto appended two sheets of explanatory drawings, in which- Figure 1 is an external elevation, and Fig. 2 a plan view, of a collapsible core as-constructed in accordance with my improvements. Fig. 3 is a sectional elevation corresponding to Fig. 1. Figs. 4 and 5 are elevations in perspective of the top and bottom chuck-disks, respectively.V Figs. 6 and 7 are an elevation and plan, respectively, of the operating movable disk-plate. Figs. 8, 9, and 10 are respectively a front elevation, plan, and end elevation of one of the collapsible core-plates and which is first operated on by the movable disk. Figs. 11, 12, and 13 are views corresponding to the-last-mentioned three figures, showing one of the other set of collapsible core-plates which is afterward actedv on by the movable disk in its upward movement. Figs. 14 and 15 are a sectional elevation and plan view, respectively, showing an additional means for expanding and contracting the collapsible core in which star-wheels are used; and Figs. 16 and 17 are detached elevation and a plan of part of one of the chucks slightly modified to permit of this arrangement.

Referring to the drawings, according to my improvements I form the collapsible core in Ytwo or more section al parts, preferably of castiron, with the usual holes c and sand-retaining pins c The preferable form would be four sectional parts, two pairs, a and o, facing each other, and these would beheld between end chuck-disks, each consisting of a central boss 0l, mounted on a central spindle e and having pro'- jecting radial arms f formed with segmental rings 'g at ends. These ends would be formed with projections t,so as to form angled grooves c' between these projections it and inner surface of rim parts g for the top and bottom ends of the plates a and b to rest in, but not extending the full breadth of arms, so as to permit freedom for play of plates. Straw or other cushioning material may be placed over the joints of the adjoining plates, over which would be placed the usual loam coating. A movable `disk-plate j would be mounted over spindle e near the top end chuck-disk and have cast on it staple eye fastenings lo, and the spindle e would be screw-threaded and be fitted with an adjustable tightening-up nut Z.

After the core has been inserted into moldboX and the molten metal run in the nutZ would be screwed up about two inches on `spindle e, and the latter would be struck or pressed down that distance to relieve the lower chuck-disk lf g, and the movable disk jwould then be operated by a pulling-chain m or like device attached to the staple-fastenings k.

The lower chuck-disk is keyed to its shaft, while the upper one is free to slide thereon subject to the position of the nut Z on the threaded spindle e. y

It will be noticed that the plate j first lifts the upper chuck g, slightly freeing it of the plates b, which are free to fall inward. They had previously been loosened from the lower chuck g when that chuck was lowered away from them by striking the'spindle e. Then as the plate j' abuts against the pins 0 and p the entire core may be lifted out in a suiicientlycollapsed condition to make its egress possible.

In a modified arrangement (shown in Figs. 14 to 17) the star or four-armed wheel q would be mounted near each endof spindle e, so that in one position when it was turned these arms g IOO Would bear on projecting surfaces 7 on plates to keep them in their extended-out position, but

` when the spindle e is turned to another position, as shown in dotted lines, Fig. 15, these arms q would be freed from inner surface 1 of plates and permit them to collapse to the drawing-out position ot' core from mold-box.

I claim as my invention- 1. A collapsible core-bar, comprising a center spindle, chuck-disks having radial arms` projections, and grooves, sectional plates embraced between and working in .the grooves of said chuck-disks, projections on said plates, and a movable disk adapted to act on said projections on the sectional plates to liberate them.

2. In Combination, a central spindle, a screwed nut working on said spindle and forming'a stop device, chuck-disks having radial arms, projections and grooves, sectional plates embraced between and Working in the grooves of chuck-disks and projecting` pins on said plates, a movable disk adapted to act on said projecting pins on the sectional plates to liberate them. Y

3. In combination, a center spindle, chuckdisks having radial arms, projections and grooves, sectional plates embraced between and working in the grooves of the chuck-disks, and means for collapsing said plates.

4. In combination, a center spindle, chuckdisks having radial arms, projections and grooves, sectional plates embraced between and working in the grooves ol chuck-disks, means for collapsing said plates, and starwheels adapted to hold said plates outward in one position and adapted to be freed of said -plates in another position.

In testimony whereotl I have signed my naine to this specilication in the presence olE two subscribing witnesses.

ALEX. S. GOLDIE.

Witnesses:

R. C. THOMSON, THOMAS BENNIE BRowNLIn. 

